According to some “reliable” specs over on NeoGAF, the PS4 hardware is “more or less set in stone.” The forum post indicates that the PS4, codenamed “Orbis” will feature a AMD CPU with 4 cores and a AMD GPU capable of producing 1.8 teraflops. The RAM is also set at a rather low 2GB of GDDR5 RAM, and unlikely to be upgraded to 4GB.